Using a Phone Line for Data
The telcos of the world were originally created to let you talk
to someone else using a telephone. Almost every home in America has a local
phone line installed in it. That phone line runs from your house, typically
underground, to a local telco central office (CO). You can use your phone to
make a call almost anywhere in the world, and the call goes over the phone line,
called a local loop, to the telco CO,
through its network, and on to the other phone.
When you make a call, the telco creates a new voice circuit on
your behalf. A voice circuit is just telco lingo
for the ability to send and receive voice between two phones. Another term you
should know is Public Switched Telephone Network
(PSTN), which refers to the combined telco networks in the world.
Although the local phone line was originally intended for
supporting voice, it can also support the transmission of data. Next, you learn
a little about how that works and then see how you can use a local phone line to
send data to and from an ISP.
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